Pahoehoe lava. Molten pahoehoe lava spills from a lava tube (centre right) before pouring over the edge of a cliff. Pahoehoe is a thick lava which may flow at speeds of up to 50 kilometres per hour. Lava tubes are formed when the surface of a river of molten lava cools and solidifies,but the interior remains hot and liquid. Pahoehoe lava is a type of basic lava with a low silica content,giving it a low melting point. This means the lava can travel great distances from the crater or vent from which it issued. Photographed at Kilauea volcano,Big Island,Hawaii,USA | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Lewis, G. Brad |
Taille de l’image : | 5158 px × 3425 px |
Model Release : | Non requis |
Property Release : | Non requis |
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